Electrical-ignition spark-coil for gas or vapor engines.



PATENTED APR. '7, 1908.

E. Q. WILLIAMS. BL'EGTBIGALIGNITION 'SPARK COIL FOR GAS 0R VAPOR ENGINES.

APPLIOATION FILED DBO. 28.1904.

2 SHEETS-SHEET 1.

WITNESSES;

WENTHH ammzm-w y PATENTEDAPR. 7, 1908. B. Q. wimmsa.

ELEGTRIUAL IGNITION SPARK G'L HER GAS 0R VAPOR ENGINES.

APPLIOATIOE XIX; DEG. 28.1904.

2 SHEETSSHEET2.

ESSES I l-pNaMup if E MAM.

UNITED sT-Arns PATENT OFFICE.

EDWARD Q. WILLIAMS,.OF SYRACUSE, NEW YORK, ASSIGNOR TO THE CONNECTICUT TELE- PHONE & ELECTRIC COMPANY. RATION OF CONNECTICUT.

ELECTRICAL-IGNITION SPARK-COIL FOR GAS OR VAPOR ENGINES.

Specification of Letters Patent.

Patented April 7, 1908.

Application filed December 28, 1904. Serial No. 238,6}2. 4

' C01 s for Gas or Vapor Engines and forAnaloders 73, 74, of an engine connected by suitgous Purposes, of which the following, taken in connect on with the accompanying drawconstructed and attached to the elements in a suitable manner, preferably in a lon itude ings, is a full, clear, and exact description.

My invention com rises certain improve ments particularly a apted for use with gas or va or or hydro-carbon motors, used upon vehic es,'boats or for other purposes.

My improved s ark coil comprises first, a separate spark ma ing section or element for each cylinder of a multiple cylinder engine,

said sections being constructed and arranged .to be placed side b side within an outer case, each nearly comp etc in itself, identical and interchangeably removable, with connections and attachments in such manner'as to facilitate adjustments, removal, interchange and eilicient operation.

My improvements also comprise an improved combination battery switch, a current interrupting vibrator, a su ort' and adjustment thereof, and. a removable bridge, as will be hereinafter more particularly de scribed.

My improvements are confined to these parts, the remaining ortions being of the usual or any preferre form, hence are not herein more fully described.

, In the accompanying drawings, Figure 1,- is a front perspective view, the case being part1 broken away, and one element partly with rawn. Fig. 2, similarly represents a sectional view through one coil or element showing the electrical connections and fastenings. Fig; 3, is a partial section of the case and switch connections. Fig. 4, is an inverted plan of the switch. Fig. 5, is an inverted plan of the bridge. Fig. 6, is an inverted plan of the contact spring. Fig. 7 is a diagrammatical illustration of my improvement, consisting of a, double coil as used in an u right dash board osition with cover on; a so batteries and ouble cylinable wiring as shown.

ln'the accompanying drawings 1 represents the exterior case to contain twoicoil' elements 2 2 placed side by side, preferably,

each within a thin wooden casing and fitted capable of operating the coils.

to slide into the outer case, the vibrator 3 being upon the front or open end, which ma be provided with a suitable cover; and all electrical attachments at or near the rear or farther end thereof.

-' The separate electrical connections for primary and secondary circuits are formed y bolt screws or bindingposts l7 and 3.8,

nal position, and of such length that when the element .is placed within the case, the binding posts pass throu h suitable apertures 4.0 and 41 in the has of the case, and that binding nuts 19 and 20 and lock nuts 21,22 placed thereon, will draw and hold the element securely in place, and furnish convenient exterior attachment for the connecting wires 56,. to the engine.

The main common or return connection is formed through a metallic strip 24 technically termed bus-bar, the'interior of the case 1, the connection from the elements thereto being made by springs 23 bearing thereon, one of which springs is attached to each element and in.

suitable electrical connection with the interior windings thereof through the spring 2.3, and wire 52 to the vibrator.

The return current is conducted from the bus-bar 24 by suitable means as wire 29 to the switch 30 and thence by wires 27, 28 to binding posts 25 and 26 and by suitable wirin to the batteries.

' This construction obviates any attachment to the front of the case, which gives a handsome ap earance, easy access to the vibrators, faci ity of operation, and security.

I In order to withdraw or replace anelement, it isonly necessary to manipulate thenuts u )on the two binding posts protruding, when t 1e element will sli e out or in freely, as for examination, re airs, substitution or inspecting trouble. l hile in use the ele ments are securely held in proper place against vibration or accident.

The batteries, are preferably set up in two independent sets or banks of cells, 67, 68

extending across within.

INCORPORATED, OF MERIDEN, CONNECTICUT, A CORPO- each of which in a normal condition is One polarity, as the positive, is connected by suitable means as wires 62, 63, and bolt 64 to the engine, and the other polarity-of each battery is separately connected as by wires 58,59 to one of the binding posts or 26 and by wires 27, 28 to es 34-, of switch improved itc composed of three s, 132, and attached to suitable U BQwhich provided with four holes, 38 adapted to receive the SVltCll 1 in such manner that said plug when ier of the holes 36 or 37 shall have "rt-real bearing contact upon the plate 32 cl upon one of the plates or as; but len in the hole 35 the plug shall have contact a" on the plate 32 and upon both plates "e nc 3%. The plates 32, 33, and 34, are of such spring material that the bearing portions may have a suitable spring pressure contact upon t-re plu thereof.

plates 33 and 34 are independently t ically connected through wires 27, 28 he binding posts and 26 and wires 58, 59

I n O {vi h the batteries; also the plate 32 is connected by wire 29 or otherwise through bus bar 2 1 and spring 23 with the coil; hence this plug when placed in either of the holes 36 or i Wlll electrlcally connect the coil with one ark of batteries; but when said plug 1s laced in the hole it connects the coil with both banks of batteries in parallel or multiple cnnection; giving the same electrical vol.- age, but the amperage current capacity of both banks of batteries combined, which is useful with weak, low or run-down batteries,

or when greater power than one battery is desires. The plug 31 when placed in the hole makes no connection of the switch late, hence the batteries are open-circuited prevented from operating or runninp The plug may be removed and carried 6 pocket to preventoperation by unau- Each elementis composed iron 39, with primary winding b is connected to terminal 17, the nt sing through screw 9, vibrator 3, contact spring 15, thence by wire 52 to Over the primary is Wound the secondary 48, and connected to terminal 18, and to'wire 52. The condenser .50, is connected at one end to wire 51, and at the other end by wire 55 to wire 52, thereby bridging the vibrator. V l

The current interrupter is a vibrator con sietin of a flexiblesprin 5 which may be provided with a Wei ht orliead 3 and having a contact point P o platinum 'or other suitable material. This vibrator is supported and adjusted'as hereinafter described. Another spring 15 is separately supported from the case and carries an opposing or striking contact P. These contact points constitute the electrical circuit breaker, being suitabl electricall connected in the primary circuit through t e springs, so that separating these points opens the circuit and interrupts the quality of metal, as shown in Figs, *1 and 2, the base portion, provided with ears or feet tor fastening to the case by means of screw 9, and having a fiatporticn 54: over its base. The vibrator spring 5 is attached thereto, by a screw 16 passing through. and thread d into the block clamping the rater spring lirrnlyto the upper portion 5a; thereoi, Another screw 6 is threaded through 54 and. 7, end bearing upon the base 4 as shown in Pi 2; hence when the screw {5 is turned to the right, its end bearing uuon the stationary base l resisting advance, tnere follows-a lifting effort to the portion S t-and parts sue pended, which by means of the flexure of the curve 44, are tilted upward and effectively raises the vibrator, or increases the spring tension thereof. Conversely turning the screw to the left, lowers the vibrator or lessens the tension. The split and pinch screw 8 serve to clamp the screw 6 securely, yet allow adjustment. v

The spring 15 is sup orted u one block 13 or'other support whic is suita 1y attached to the case. The end is provided" with a slot S, and is clamped firmly by a screw 14, which if loosened permits ready removal of the s ring for access to the contact points or ot ier purposes.

To examine or clean the contact points, it is only necessary to loosen the screw 14, when the spring 15 can be slipped out, leaving the lower contact in full view and both freely accesslble. A bridge 10 spans over the vibrator and supports an adjustable contact screw 11 which may be screwed down to bear properly upon the vibrator to limit its upward movement, as a means of adjusting or varying the s ark. The split, in connection with .the pincl'screw, clamps it securely yet allows adjustment.

The bridge 10 is constructed with lugs or feet and attached by screw bolts 12 with nuts in the interior of the case as shown in Fig. 2, the feet being rovided with'slots S so that by merely slac ing these screws without re moving lrorn the nuts, the bridge may be readilv slipped therefrom, and also replaced when for any reason this may be desired, as

for instance, examination, cleaning, subsii tution or to facilitate other or operation.

The operation of my improved coil is as follows: The case 1 is att (lied in a suitable position upon the vehicle, lmat or other place tobc used; the elements 2, 2 being then placed within the'case, and suitable w 1res;at- .tachedttf the binding posts and leading to. the battery and engine as 56, 57, :58, 59, 60, 61, 62, 63 and 64.'- Wl1en properv "connec' tions are made and the switches on, the electric current of thebattery 67 will pass to the engine at bolt 64, through the commutator LQ there'of to its selective circuit at brush 65,

thence by wire 56 to the binding post of elescans :3

ment 2, through its primary winding -12 and vibrator, then to the terminal spring-23 and bus bar 24 and by wire 27, to plates 34, 32,

of switch 30, and return through wire 58 to the battery. f In lug. 7, the switch is in position to permit only the battery 67 to' act, while in b igs. 1, 4, the switch is in position to allow both'banks of batteries 67 & 68 to act conjointly. The electric current passing through the primary winding 42 inagnetizes the core 39, and this magnetism attracts the vibrator, which by flexure of its spring, moves towards the core; but in so doing it moves away from the opposite contact, the

5' contact points P P separate','o ening and interrupting the circuit; when t 1e electric currentceases to flow and the core loses its magnetism, the vibrator then ceases to be attracted, and with the tension of its spring moves back to its first position, and again bringing the platinum points into contact completes the circuit, which repeats the foregoing cycle continuously as long as effective current is supplied to it. This making and 5 interrupting o the primary current andoore magnetism induces a high tension current in the secondary 43-, which is led by the circuit to the sparking plug'69, 70, producing a spark 71 for igniting the engine anddriving have described my coil as particularly adapted to, vehicles engines, but obviously my improvements may be used for any suitable urpose. Portions may be used without t e whole, or various changes or equivalent modifications may be used; as for instance, a dynamo or other source of electric current may be used, and one or more than two sources of current may be employed. The binding posts may be exterior screws with interior nuts, and may be in other-than a longitudinal position. Screws may be used in lieu of springs 23. The bus-bar maybe of other form, as se arate wires running to 5 theswitch, or the us-bar may form one plate of the switch. Instead of wires, other electrical connections may be em loyed. A pivoted or other lever may be use instead of a plug. The form of switch plates may be 0.changed or a greater number used. The

,switch may be placed elsewhere than upon the case. The electric circuit may be made through the bridge and screw, or a contact or circuit conducting screw may be placed 56 above the '5 ring 15. The s ring 15 may be supported om the bridge cQ a use herein the term gas engine to inelude engines of an internal combustion type, whether using gaseous, or vaporous or liquid n fuel. i

' aving thus described my improvements, I'claim,-

1. In a sparli'coil for gas, vapor or hydro carbon engines, an outer case containing ris/separate insertible sparkingcelements, each ternal connection thereon sulistantially-as its Ipiston 72 by the explosion of gas therein,

mg posts having a suitable vibrator upon one end, and all electricalconnections at, or near the other end, some of which connections protrude through the case and are provided for exand tor-the pur ose shown and described.

In a spar coil for multiple cylindered gas or vapor engines, an outer case contain ing separate insertible sparking elements, one for each cylinder, and each having a suitable vibrator upon one end, and the electrical connections at or near'the other end, some of which connections protrude through. the case and are provided for external connection thereon substantially as shown and de- 30 scribed,

3. The combinationwith a multiple spark coil for multiple cylinder engine of a case,

containing separate interchangeable removable elenients, each element comprising a 35 complete spark coil for a single'cylinder, said elements being removable by detaching the exterior connection thereto asand for the purpose set forth.

4 In a spark coil for'gas or hydrocarbon engines, an outer case containing separate insertible sparking elements, each having a suitable vibrator upon one end, and all electrical connection's at or near the other end, and as a common or. ground connection, a metallic strip within the case and springs bearing thereon, said s rings being electric-- .ally connected interior y to the pole of the element, substantially as set fort 5. Inia multiple coil for gas engines, a case eontainin separate elements, each interchangeabIy removable, and connected with the primary and secondary circuits by bindextending longitudinally through the case andv connected with the general return as ground circuit by means of a s ring and bus bar and switch, substantial y as shownand described. i

6. In a multiple coil for gas engines, a case containing removable elementsthe electric connection of which comprises a longitudinal binding post for each engine circuit, and a spring connection to a bus-bar or general. connection to the battery thereof, substantially as shown and described.

'7. In a s ark coil such as described, insertible sections provided with electric terminals, binding sts protruding through the case, and nuts't ereu'pon securing said sections therein, substantially as specified.

8. The combination of the outer case, suitable sparkingsections therein, each having primary and secondary binding posts, and return circuit including a spring upon each section, and a common bus-bar, asand for the purpose specified.

92 In a spark coil. the combination otremovable elements, a suitable spring for the ground connection, and suitable binding posts or screws for each element, all arrange 3 isiiie l. with a said strip, seitl suitable elecfor gas enare removable from se, electr current connection thereon comprising binding posts for the batteries, wiring therefrom tc a multiple switch a'ttiiclieti thereupon, thence through a busber or general connection by spring contact to each section and suitably with the interior thereof, then cc to binding posts set longitutlinally in the rear of said element, substantially as shown and described.

12. in a spark coil with removable sections, one or more electric cir uits rovirled withsuitable binding posts, and saicfbinding posts passing through apertures of the outer case, with binding nuts thereon, for the clouble purpose to secure the element firmly and to eilect convenient exterior connection thereto, substantiallyas set forth.

13. in a spark coil for engines of the class herein described, an outer containing removeble elements, each with a vibrator and separate prim cry and secondary wire connections, sncl a common or ground return con- :isting' a metallic strip extending across the case, with suiteblesprnig u clement, substantially as a so: i coil for engi es of the class e1 oeseribeil, en cuter case containing ole el TQ- "'tCll with avibratb i' end 7 and secondary wire (oninon or ground return cons ERIE strip extending across the interior of the case, with suitable spring connections to each element, substantially as shown and describe in a sparl: coil as herein described, a case, separate removable elements therein, binding posts for the primary and secondary wires, and common return through a meic strip or buszbar, substantially as shown antl described.

" in a spark coil as herein described, a

n0. case, separate removable elements therein,- binding nuts for the primary and secondary wires an scommon return through a me-' tallic strip or busbai', and switch, substantially SllOWIl and described.

l7. spark coil herein described, a separete removable elements therein, p for the primary and secondary wires, and a common return through c metal-- lic strip or bus-bar, and said binding posts positioned. parallel with the longitudinal axis oi the element, facilitate substantially described.

18. In a spark coil as herein (iescrircil, a case, separate removable eleinei-it-s therein, binding posts for the primary and secondary wires and a common return th' lie strip or busbar, and son: protruding tlirougl'r the bottom case.

.9. In a spark coil as herein described, a case, separate removable elements therein, binding posts for the primary :1 V 5. wires, and a common return ti -o moo-i lic strip or bus-bar the said binding posts rotruding through the case, curl having inding nuts to secure said elements in peel-- tion.

20. In combination with a. sperl; coil and electric circuit thereto, 9.- primary-switch which in a certain position connects one source of electric energy to the coil, and e certain other position connects two sources of electrical energy conjointly to the coil,

substantially as and for the purpose set forth.

21. In combination with a spark coil and electric circuit thereto, an electric switch which in a certain position ins connect one source of'electrical energ to the coil, and in a certain other position may connect two sources of electrical energy conjointly to the coil, and in another position shall open all circuits, substantially as and for the purpose described.

22. In combination with. a sparking coil for gas engine, the electric current thereof supplied by batteries; an electric switch, one position oi which s iall-complete the electric circuitof one battery singly, and in one position shall com ilete tlie circuit for two bat terics conjoint substantially as shown and described.

23. In combination with a sparking coil for gas engine, the electric current thereof which is supplied b batteries; a plug switch,

one position of w ich shall com lete the electric circuit qfone battery sing y, and in one position shall com late the circuit 'for two batteries conjoint y, substantially as shown and described.

24. In combination with a sparking coil for gas engine, the electric current thereof which is supplied by batteries; :1- switch with s ringing contacts, one position of which sliall complete the electric circuit of one battery singly, and in one position shall completethe circuit for two batteries conjoint! substantiall as shown and described.

25. In co nbination with a spark coil and battery circuit thereof, a plug switch containing thre a or more plugging holes, two each connecting a single circuit independently,

- battery circuit thereof, a circular plug switchcontaining four plugging holes; one not connecting the circuit, two-each connecting a single circuit, and. one connecting two cir cuits in multiple thereof, substantially. as

' shown and described.

27. A multiple coil composed of separate elements. removably contained in a common case, said elements having'three wire connections, one primary and one secondary thereof having binding posts, and the c o mmen or ground connection having a spring connection, substantially as and for the purpose shown.

28. in a spark coil, a current interrupter composed of a head supported andvibrated by a spring, said spring adjustably supported to the case, and a receiving spring independently supported to the case, these springs being in suitable electrical connection with the primary current thereohand platinum or protected oints at the contact points constituting the current breaking element, substantially as shown and described.

29. In the current interrupter portion of a spark coil, a main vibrator, one end adjustly supported from the case, its other end provided with a metallic head suspended opposite oi the core, the electric breaking contact at its extreme end, and a su plementary vibratin spring, one end rigid -y supported and its ire/e end carrying the back electric contact; together with suitable electrical connections and a source of electrical energy substantially as and for the purpose shown and described. 7

30. In a spark coil, a vibrator support and adjustment thereof, composed of a U spring one portion of which is rigidly attached to the case, and another portion to the vibrator,

and an adjusting screw for regulating said U spring in adjusting the vibrator, substantially as shown and described. I

31. In a spark coil, a current interrupter composed of a vibrating spring carrying a contact point, adjustably supported by a U support of still spring metal, provided with an adjusting screw, and a receiving'contact upon a spring independently supported, these springs being in suitable electric circuit with the primary current, and with suitably protected points thereon, constituting the current breaking element, substantially as shown and described.

In aispark coil vibrator, a spring, one end suitably supported from the case, the other end magnetically actuated, and carrying a current interrupting contact point, and a secondary or receivin spring, one end independently supported cm the case, and an opposing contact point upon the free end,

these contact points composing the electric current interruption, substantially as and,

for thepurpcse shown and described.

33. In a spark coil, a current interrupter,

thereof, composed of a U support of spring material, one portion attached to the case the other portion carrying a vibrator;-

spring, and provided with an adjusting, screw, and a split and clamping screw there of, said spring vibrating against a back contact or stop, suspended from a bridge or bar -spanning said spring, substantially as shown and described.

34. A vibrator support and adjustment thereof, composed of a U spring, one part of which is rigidly secured to the vibrator, and an adjusting screw for regulating the posi: tion of said spring in order to give proper desired adjustment to the vibrator, substantially as set forth.

35. A vibrator support and adjustment thereof, composed of a U spring, one part of which is rigidly attached to the box, and the other flat part attached to the vibrator, and an adjusting screw for regulating the position of said spring, in order to give proper desired adjustment to the vibrator, substantially as set forth.

36. In a current interrupter for spark coils, a vibrating spring, one end carrying a circuit breaking contact, and the o posite end rigidly attached upon a suitable b ock by means of a clamping screw, and said spring being slotted to facilitate removal and replacement, substantially as and for the pur pose shown and described.

37. In a spark coil, a vibrator s ring secured by a screw, the screw hole t ereof in the spring being slotted out, so that by loosening said screw, the vibrator may be removed without takingoutthe said screw, substantially as shown and described.

38. In a spark coil, a bridge supportin a contact screw, said bridge being attached by screws, the holes for said screws being slotted out so that by loosening the screws the bridge may be removed without takin out said screw, substantially as shown an described. r Y

39. In a spark coil, in combination with necessary elements, a vibrator bridge, an adjusting screw supported therewith, and secured by a split and clamp screw, said bridge attached to the case by screws, the holes for said screws being slotted out to provide for removal of said'bridge without taking out said screws, substantially as shown and described. I

40. In a spark coil rovided with a vibrator, a contact screw t ereof su ported by a bridge, said bridge being attac ed to the coil case by lugs secured with screws or bolts,

- the holes for said screws or bolts being slotted through upon one side to facilitate removal thereof.

41. in a spark coil the combination with an electric circuit therefor, a vibrator, the contact screws thereof su ported by a bridge provided with lugs, said ugs secured to the case by screw bolts with nutsupon the interior of the case, the holes for said bolts being slotted to facilitate removal Without removing from the nuts thereof.

42. in combination, a box or frame, a plurality of induction coils mounted therein, individual connections for the primary winding of each coil, means including a bus-bar whereby any coil can be removed from the box or frame without disturbing the primary connections of the other coils.

43. in an i nition system, the combination of a box ori rame, a plurality of induction coils mounted therein, and independently removable therefrom, a source of electricity common to all the primary windings of said induction coils, electrical connections includa bus-bar connection established bythe mounting of a coil in the box or frame to connect its primary coil in circuit with said source of electricity, and independent circuit connections whereby the removal of a coil fromthe box or frame will not affect the electrical connections to the other coils.

4%. In an i nition system, the combination of a box or frame, a plurality of induction coils mounted therein and independently removable therefrom, a source of electricity common to all the primary windings of said induction coils, firing devices external of said box or frame, electrical connections including a bus bar connection established by the mounting of a coil in the box or frame to connect its primary coil in circuit with said source of electricity, and independent circuit connections whereby the, removal of a coil from the box or frame will not affect the electrical connections to the other coils.

-15. In an i nition system, the combination of a box or name, a plurality of induction coils mounted therein and independently removable therefrom, an electrical contact permanently fixed in the box or frame for each induction coil, and means for mechanically fastenin each coil in the box, which means also comprises an electrical connec tion for a terminal of the primary winding, said contacts being electrically connected to gether.

in. In an ignition system, the combination of abox or frame, a plurality of induction coils mounted therein and independently removable therefrom, an electrical contact permanently fixed in the box or frame for each induction coil, means for mechanically fastening each coil in the box, ,wnich means alsocomprises an electrical connection for the primary winding of said coil, said contacts being electrically connected to ether, and independent circuit connections w iereby the removal of a coil from the box or frame will affect the electrical connection to the other coils. I

47. In an ignition system, the combination of a box or frame, a plurality of induction coils mounted therein, and independently removable therefrom, an electrical contact permanently fixed in the box or frame for each induction coil, means for connecting the terminal of the primary Winding of each coil with said contact, said contactsbeing electrically connected together Within or upon the box or frame and to one pole of a source of electricity.

48. In an ignition system, the combination of a box or irame, a plurality of induction g0 coils mounted therein and independently removable therefron'i, an electrical contact permanently fixed in the box or frame for each induction coil, means for connecting the primary winding of each coil with said contacts, said contacts being electrically connected together Within or upon said box or frame and to one pole .of a source of electricity, 4

49. In an apparatus of the character dc 0 scribed, a case, a plurality of separate insertible induction coil units, primary and secondary terminals rojecting from each unit, a bus-bar carried by the case arranged to make electrical connection with one terminal on each coil unit upon. the insertion of the same within the case, a mechanical connection for another terminal of each coil unit to hold the latter in the case, said mechanical connection also accomplishing an electrical. 190 connection.

50. An apparatus of the character described, a case, a plurality of separate insertible induction coil units, primary and secondary terminals projecting from each unit, a circuit connector in common to all units, connected with one of the primary terminals of each unit, and independent circuit connections for the other primary terminal of each coil unit.

51. In a multiple coil for gas engines, a case containing separate elements, each interchangeably removable and connected with the primary and secondary circuits by connections extending through the case and connected with the general return or ground circuitby means of a spring, bus-bar and switch.

'52. Ina multiple coil for as engines, a

case containing removable cements, elec- 12o trical connections for each element including a spring connection to a bus-bar or general connection to the source of electrical energy thereof.

53. A spark coil with removable elements, 12 having as a common or grouno connection a metallic strip attached to t re case, also each element providd with a spring arranged to engage said strip, said springs being provided withsuitable electrical connections within each element and said metallic strip being electrically connected to a suitable source of electrical energy. I I

54. In a spark coil as herein described, a case, separate removable elements therein, connections for the primary and secondary Wires, and a common return through a metallic strip or bus-bar.

. 55. In a spark coil as herein described, a case, separate removable elements therein, electrical connections for the primary and secondary wires, and a common connection through a metallic strip or bus-bar and switch to a source of electrical energy.

56. In an ignition system, the combination of a box or casing, a plurality of induction coils mounted therein, a contact for the rimary Winding of each coilmounted in the box, or casing, an electrical connector between such contacts within the box, a source of electricity, a connection between said source and saidconnector, a contact on each coil adapted to engage one of said connected contacts to connect its primary winding in "circuit with. said source of electricity, and innot affect the electrical connections to the other coils.

57. In an ignition system, the combination of a box or casing, a plurality of induction coils mounted therein, a contact for the primary winding of each coil mounted in the box or casing, an electrical connector between said contacts, a source of electricity, a connection between said source and said. connector, firing devices external to said box or easing, a contact on each coil adapted to engage one of said connected contacts to connect its primary winding in circuit with said source of electricity, and independent circuit connections whereby the removal of a coil from the box or casing will not affect the electrical connections to the other coils.

I EDWARD Q. WILLIAMS. -VVitnesses J H. MoREoRoFT, FRANK R. WILLIAMS 

